<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="vue.js"></script>
</head>
<body>

    <div class="app">
        <input type="text" v-model="val">
        <h1>{{val | trim}}</h1>
    </div>


      <script>
                new Vue({
                el: ".app",
                data() {
                    return {
                    val: 0
                    }
                },
                filters: {
                    trim(val) {
                    return (val * 1).toFixed(2) + "元";
                    }
                }
                })
      </script>
</body>
</html>